The difference between a Python class method, a static method, and an instance method

1 #-*-encoding:utf-8-*-2 3 classDate (object):4     def __init__(self, year, month, day):5Self.year = Year6Self.month =Month7Self.day = Day8 9     #instance MethodTen     defTomorrow (self): OneSelf.day +=1 A  -     #static method (disadvantage: Need to write a fixed class method name date) - @staticmethod the     defparse_from_string (DATA_STR): -Year, month, day = tuple (Data_str.split ("-")) -         returnDate (int (year), Int (month), Int (day)) -  +     #class method (passed in the CLS class itself without a fixed class method name date) - @classmethod +     defparse_string (CLS, data_str): AYear, month, day = tuple (Data_str.split ("-")) at         returnCLS (int (year), Int. (month), Int (day)) -  -     def __str__(self): -         return "{Year}/{month}/{day}". Format (Year=self.year, Month=self.month, day=self.day) -  - if __name__=="__main__": inData_str ="2018-6-29" -     #Invoking instance methods todata = Date (2018,6,29) + Data.tomorrow () -     Print(data) the     #calling a static method *     Print(date.parse_from_string (DATA_STR)) $     #Calling class methodsPanax Notoginseng     Print(Date.parse_string (DATA_STR))

The difference between a Python class method, a static method, and an instance method